KR20030001772A - Plasma display panel - Google Patents

Abstract

PURPOSE: A plasma display panel is provided to increase brightness by making a separation wall corresponding to a discharge cell embodying a blue color have a well type, and to gas injecting/exhausting efficiency by forming a hole or groove in the separation wall of a well type. CONSTITUTION: The first separation wall(50) separates discharge spaces for red, green and blue. The second separation wall(52) separates discharge cells vertically adjacent to the discharge space for a specific color from the discharge space for the specific color, formed in the first separation wall. The first separation wall is of a stripe type and the second separation wall is of a lattice type.

Description

Plasma Display Panel

The present invention relates to a plasma display panel, and more particularly, to a plasma display panel capable of increasing color temperature.

Recently, flat display devices such as a liquid crystal display (LCD), a field emission display (FED), and a plasma display panel (hereinafter referred to as "PDP") have been actively developed. . The PDP emits a phosphor by 147 nm ultraviolet rays generated when the He + Xe or Ne + Xe inert mixed gas is discharged, thereby displaying an image including characters or graphics. Such a PDP is not only thin and large in size, but also simple in structure, and has a high luminance and high luminous efficiency as compared to other flat display devices. Due to these advantages, research on PDP is being actively conducted.

The three-electrode AC surface discharge type PDP has advantages of low voltage driving and long life because wall charges are accumulated on the surface during discharge and protect the electrodes from sputtering caused by the discharge.

Referring to FIG. 1, a discharge cell of a three-electrode alternating surface discharge PDP includes a pair of sustain electrodes formed on an upper substrate 10, that is, a scan / hold electrode 12Y and a common sustain electrode 12Z, and a lower substrate 18. Is provided on the address electrode 12X. The sustain electrode pairs 12Y and 12Z are formed of a transparent electrode 12a and a bus electrode 12b. The upper dielectric layer 14 and the passivation layer 16 are formed on the upper substrate 10 on which the sustain electrode pairs 12Y and 12Z are formed. The upper dielectric layer 14 accumulates wall charges generated during plasma discharge. The passivation layer 16 prevents damage to the upper dielectric layer 14 due to sputtering generated during plasma discharge and increases emission efficiency of secondary electrons. As the protective film 16, magnesium oxide (MgO) is usually used. The lower dielectric layer 22 for wall charge accumulation is formed on the lower substrate 18 on which the address electrode 12X is formed. The partition wall 24 is formed on the lower dielectric layer 22, and the phosphor 20 is coated on the surfaces of the lower dielectric layer 22 and the partition wall 24. The partition wall 24 prevents ultraviolet rays and visible rays generated by the discharge from leaking into adjacent discharge cells. The phosphor 20 is excited by ultraviolet rays generated during plasma discharge to generate visible light of any one of red, green, and blue. Inert gas for gas discharge is injected into the discharge space provided between the upper and lower substrates 10 and 18 and the partition wall 24.

The discharge cell of this structure is selected by the counter discharge between the address electrode 12X and the scan / hold electrode 12Y, and then sustains the discharge by the surface discharge between the sustain electrode pairs 12Y and 12Z. In such a discharge cell, the fluorescent substance 20 emits light by ultraviolet rays generated during sustain discharge, so that visible light is emitted to the outside of the cell. As a result, the discharge cells adjust the period during which the discharge is maintained to implement gray scale, and the PDP in which the discharge cells are arranged in a matrix form displays an image.

The partition wall 24 of the PDP is divided into a stripe structure shown in FIG. 2 and a well structured partition structure shown in FIG. 3. In the case of the stripe-shaped partition wall 26 structure, the exhaust gas is easily exhausted, but the coating area of the phosphor 20 is small. In the case of the well-formed partition wall 28, the coating area of the phosphor 20 may be increased to increase luminance, but the exhaust gas may not be well exhausted.

A discharge cell having a constant width is formed between the stripe-type or well-shaped partition walls 26 and 28. Since the discharge cells have different discharge voltages and light emission characteristics of phosphors of red (R), green (G) or blue (B), the discharge cells of the discharge cells implementing red (R), green (G) or blue (B) The luminous efficiency is different. In particular, the light emitting efficiency of the discharge cells implementing green (G) is higher than the light emission efficiency of the discharge cells implementing red (R) and blue (B), and the blue light emission efficiency of the discharge cells implementing red (R) ( It has a higher characteristic than the luminous efficiency of the discharge cell to implement B). Accordingly, in the related art, the white balance is adjusted by adjusting an adjustment point to a discharge cell having the lowest luminous efficiency to achieve a blue color. However, in this case, the overall luminance of the PDP is lowered.

In order to solve this problem, a PDP having an asymmetric partition structure as shown in FIG. 4 has been proposed.

Referring to FIG. 4, the PDP having the asymmetric partition wall 30 structure implements a discharge cell 32R that implements red (R), discharge cells 32G that implement green (G), and blue (B). The discharge cells 32B are formed to have different widths. That is, due to the asymmetric partition wall, the area of the discharge cells is also differently formed for each of the discharge cells 32R, 32G, and 32B to implement red (R), green (G), and blue (B). The area of the discharge cells is the largest to form the discharge cell (32B) for implementing the blue (B) of the lowest luminous efficiency, and the smallest of the green (G) discharge cell (32G) of the highest luminous efficiency. That is, since the area of the discharge cells 32G to implement green (G) is the smallest and the area of the discharge cells 32B to implement blue (B) is the largest, the luminance ratio of red (R) to green (G) is It is slightly lowered, and the luminance ratio of blue (B) to green (G) is slightly higher. As a result, the luminance imbalance between red (R) and blue (B) is eliminated.

The PDP having such an asymmetric bulkhead structure has a different size of each discharge cell for implementing red (R), green (G), and blue (B), and thus the driving voltage applied to the PDP. The ramp waveform is used in the reset section to equalize the different driving voltage, but the address voltage is different. That is, it is difficult to adjust the voltage of each discharge cell.

Accordingly, an object of the present invention is to provide a plasma display panel for improving color temperature.

1 is a cross-sectional view showing a conventional three-electrode AC surface discharge type plasma display panel.

2 is a perspective view illustrating a stripe-type partition wall of a conventional plasma display panel.

3 is a perspective view illustrating a well-type partition wall of a conventional plasma display panel.

4 is a plan view showing a plasma display panel formed of a conventional asymmetric discharge cell.

5 is a perspective view illustrating a partition of a plasma display panel according to a first embodiment of the present invention.

6 is a perspective view illustrating a partition of a plasma display panel according to a second exemplary embodiment of the present invention.

7 is a perspective view illustrating a partition of a plasma display panel according to a third embodiment of the present invention.

8A to 8F are cross-sectional views illustrating the method of manufacturing the partition wall illustrated in FIGS. 5 to 7 formed by sandblasting.

9 is a perspective view illustrating a photomask for forming a partition of a plasma display panel according to a first embodiment of the present invention.

10 is a perspective view illustrating a photomask for forming a partition of a plasma display panel according to a second embodiment of the present invention.

FIG. 11 is a perspective view illustrating a photomask for forming a partition of a plasma display panel according to a third exemplary embodiment of the present invention. FIG.

12A to 12C are cross-sectional views for explaining stepwise a manufacturing method of the partition wall shown in FIGS. 5 to 7 formed by a mold method.

<Description of Symbols for Main Parts of Drawings>

10: upper substrate 12Y, 12Z: sustain electrode

12X: address electrode 12a, 52a: transparent electrode

12b and 52b bus electrodes 14 and 22 dielectric layers

16: protective film 18, 64: lower substrate

20: phosphor 24, 30, 50, 52, 54: bulkhead

56: home 58, 60: gas flow passage

62: hole 66: dielectric thick film

68: bulkhead paste

In order to achieve the above object, the plasma display panel of the present invention includes a first partition wall for separating red, green, and blue discharge spaces, and a first partition wall for separating a discharge space of a specific color among red, green, and blue discharge spaces. And a second barrier rib formed to separate the vertically adjacent discharge cells from the discharge space of a specific color.

The specific color discharge space is characterized in that the blue discharge space.

The first partition wall is formed in a stripe shape.

The second partition wall is formed in a lattice form.

Grooves are formed on the second partition wall.

A hole penetrating the second partition wall is formed.

The first and second partitions are formed by sandblasting.

The first and second partitions are formed by a mold method.

Other objects and features of the present invention in addition to the above object will be apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 5 through 12C.

Referring to FIG. 5, the partition wall of the PDP according to the first embodiment of the present invention corresponds to the first partition wall 50 corresponding to the discharge cell implementing red (R) and the discharge cell implementing green (G). The second partition wall 52 is formed, and the third partition wall 54 corresponding to the discharge cell implementing blue (B) is provided.

Each discharge cell implementing red (R), green (G) and blue (B) is symmetrically formed with the same size. The first and second barrier ribs 50 and 62 which divide the discharge cells implementing red (R) and green (G) are formed in a stripe shape, and the third barrier wall 54 implementing the blue (B) is It is formed in a well shape. That is, the areas of each of the discharge cells implementing red (R) and green (G) corresponding to the first and second partitions 50 and 52 may implement blue (B) corresponding to the third partition 54. It becomes smaller than the area of a discharge cell. The discharge cell which realizes blue B corresponding to the third partition 54 by increasing the phosphor coating area of the third partition 54 having a large discharge cell area corresponds to the first and second partitions 50 and 52. It has higher luminance than discharge cells implementing red (R) and green (G). Accordingly, the white balance is adjusted by adjusting an adjustment point to a discharge cell that implements a red or blue light having low luminance, thereby achieving a color balance as a whole, and thus having a higher color temperature than before.

Referring to FIG. 6, the barrier rib of the PDP according to the second embodiment of the present invention corresponds to the first barrier rib 52 corresponding to the discharge cell implementing red (R) and the discharge cell implementing green (G). And a second partition wall 54 corresponding to the discharge cell implementing blue (B) and a third partition wall 56 having a groove 56 formed therein.

Each discharge cell implementing red (R), green (G) and blue (B) is symmetrically formed with the same size. The first and second partition walls 52 and 54 that divide each discharge cell are formed in a stripe shape, and the third partition wall 56 is formed in a well shape. That is, the areas of each of the discharge cells implementing red (R) and green (G) corresponding to the first and second partitions 52 and 54 may implement blue (B) corresponding to the third partition 56. It becomes smaller than the area of a discharge cell. The discharge cells that realize a blue color (B) corresponding to the third partition wall 56 by increasing the phosphor coating area of the third partition wall 56 having a large discharge cell area correspond to the first and second partition walls 50 and 52. It has higher luminance than discharge cells implementing red (R) and green (G).

In addition, a groove 56 is formed on the third partition wall 56 formed in a well shape in which exhaust is not good, to improve the exhaust capacity. This groove 56 is used as the gas flow passage 58. The gas flow passage 58 forms an air flow path on the same line so that the remaining gas can be simultaneously exhausted to the outside on the same line, and discharge gas can be simultaneously injected into discharge spaces on the same line.

Referring to FIG. 7, the barrier rib of the PDP according to the third embodiment of the present invention corresponds to the first barrier rib 50 corresponding to the discharge cell implementing red (R) and the discharge cell implementing green (G). And a third partition wall 54 corresponding to a discharge cell implementing blue (B) and having a hole 62 formed therein.

Each discharge cell implementing red (R), green (G) and blue (B) is symmetrically formed with the same size. The first and second barrier ribs 50 and 52 which distinguish each discharge cell are formed in a stripe shape, and the third barrier wall 54 is formed as a horizontal barrier rib 54a and a vertical barrier rib 54b in a well shape. . That is, the areas of each of the discharge cells implementing red (R) and green (G) corresponding to the first and second partitions 50 and 52 may implement blue (B) corresponding to the third partition 54. It becomes smaller than the area of a discharge cell. The discharge cell which realizes blue B corresponding to the third partition 54 by increasing the phosphor coating area of the third partition 54 having a large discharge cell area corresponds to the first and second partitions 50 and 52. It has higher luminance than discharge cells implementing red (R) and green (G).

In addition, a hole 62 penetrating through the horizontal partition walls 54a of the third partition wall 54 formed in a well-vented well shape is formed. The hole 62 is used as the gas movement passage 60 to improve the exhaust capacity. The gas flow passage forms an air flow path on the same line so that the remaining gas can be simultaneously exhausted to the outside on the same line, and discharge gas can be simultaneously injected into discharge spaces on the same line. In addition, the efficiency of exhausting and injecting gas is improved compared to the groove 56, which is the gas movement passage 58 shown in FIG. 6.

8A to 8F are cross-sectional views illustrating a method of manufacturing a partition wall by a sandblasting method step by step.

On the glass substrate 64 on which the lower dielectric thick film 66 is formed, the partition wall paste 68 is applied to the desired partition height as shown in FIG. 8A. After the photoresist 70 is applied on the partition material paste as shown in FIG. 8B, a photomask 72 is formed thereon as shown in FIG. 8C.

In order to form the first to third partition walls 50, 52, and 54 according to the first embodiment of the present invention, the first to third photomasks 72a, 72b, and 72c illustrated in FIG. 9 are formed. The first and second photomasks 72a and 72b are formed in a straight line shape, and the third photomask 72c is formed in a lattice form.

In order to form the first to third partition walls 50, 52, and 54 according to the second embodiment of the present invention, the first to third photomasks 72a, 72b, and 72c illustrated in FIG. 10 are formed. The first and second photomasks 72a and 72b are formed in a straight line shape, and the third photomask 72c is formed in a lattice form, and the horizontal grid 73 is separated with the first width w1 therebetween. It is formed. Since the first width w1 is finely formed, even if sand particles are subsequently sprayed, only a part of the partition wall paste 68 is removed to form a groove 56 on the third partition wall 54 formed later. .

In order to form the first to third partition walls 50, 52, and 54 according to the third embodiment of the present invention, the first to third photomasks 72a, 72b, and 72c illustrated in FIG. 11 are formed. The first and second photomasks 72a and 72b are formed in a straight line shape, the third photomask 72c is formed in a lattice form, and the horizontal grating 75 has a first width w1 shown in FIG. 10. It is formed separately with a larger second width w2 therebetween. Since the second width w2 is larger than the first width w1, the sand particles are subsequently sprayed, and the partition wall paste 68 in the region where the sand particles are sprayed is removed to remove the holes on the third partition wall 54. 62) is formed.

Subsequently, the photoresist 70 is exposed and developed to remove regions other than a mask, thereby forming a photoresist pattern 74 as shown in FIG. 8D. Sand particles pressurized using the sandblasting apparatus on the substrate 64 on which the photoresist pattern 74 is formed are ejected toward the partition wall paste 68. At this time, as shown in FIG. 8E, the barrier rib paste 68 other than the photoresist pattern 74 is removed, and the barrier rib paste 68 under the photoresist pattern 74 remains. Lastly, as shown in FIG. 8F, when the photoresist pattern 74 is removed and the partition paste 68 is fired, the first to third partition walls 50 and 52 according to the first to third embodiments of the present invention. 54) is completed.

12A to 12C are cross-sectional views for explaining step-by-step the manufacturing method of the first to third partition walls of the present invention by a mold method.

The partition wall paste 68 or the partition wall film having a predetermined thickness is coated on the glass substrate 64 on which the dielectric thick film 66 is formed. Subsequently, after the die 80 is positioned in the partition wall paste 68, a predetermined pressure is applied. Here, the grooves 80 are formed in the mold 80 to correspond to the shapes of the first to third partition walls 50, 52, and 54 according to the first to third embodiments of the present invention. Next, when the mold 80 is removed, first to third partition walls 50, 52, and 54 corresponding to the grooves 82 of the mold 80 are formed on the dielectric thick film 66.

In addition to the method of manufacturing partition walls, the first to third partition walls 50, 52, and 54 according to the first to third embodiments of the present invention may be formed by a screen printing method, an additive method, a photosensitive paste method, or the like. Can be formed.

As described above, the partition wall corresponding to the discharge cells implementing red (R) and green (G) in the plasma display panel according to the present invention is formed in a stripe shape, and corresponds to the discharge cells implementing blue (B). The partition wall is formed in a well shape. The discharge cell implementing the blue (B) formed in the well shape can obtain a higher luminance by increasing the coating area of the phosphor than that formed in the conventional stripe shape. Accordingly, it is possible to obtain a high color temperature with a symmetric cell.

In addition, the plasma display panel according to the present invention forms a hole or a groove on a partition wall formed in a well shape, thereby improving efficiency of exhaust and gas injection.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (8)

A first partition wall for separating red, green, and blue discharge spaces; And a second partition wall formed in a first partition wall separating the discharge spaces of a specific color among the red, green, and blue discharge spaces to separate vertically adjacent discharge cells from the discharge space of the specific color. Plasma display panel. The method of claim 1, And the discharge space of the specific color is a blue discharge space. The method of claim 1, And the first partition wall is formed in a stripe shape. The method of claim 1, And the second partition wall is formed in a lattice form. The method of claim 1, And a groove is formed on the second partition wall. The method of claim 1, And a hole penetrating the second partition wall. The method of claim 1, And the first and second barrier ribs are formed by sandblasting. The method of claim 1, And the first and second partition walls are formed by a mold method.